package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 套餐业务实现
     * @param setmealDTO
     */
    @Transactional
    @Override
    public void saveWitFlavor(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        //拷贝
        BeanUtils.copyProperties(setmealDTO,setmeal);

        //向套餐表插入数据
        setmealMapper.insert(setmeal);

        //获取生成的套餐id
        Long setmealId = setmeal.getId();

        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        //集合遍历
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });

        //保存套餐和菜品的关联信息
        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 分页查询
     * @param setmealPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
//        从SetmealPageQueryDTO对象中获取页码和每页数量
        int page = setmealPageQueryDTO.getPage();
        int pageSize = setmealPageQueryDTO.getPageSize();

        //设置当前页码与每页数量
        PageHelper.startPage(page,pageSize);

        //根据数据库查询实际的数据封装到对象中
       Page<SetmealVO>page1 =  setmealMapper.pageQuery(setmealPageQueryDTO);
       //将查询到的总页数量和当页数据封到对象并且返回
        return new PageResult(page1.getTotal(),page1.getResult());
    }

    /**
     * 批量删除套餐
     * @param ids
     */
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        //遍历
        ids.forEach(id ->{
          Setmeal setmeal =  setmealMapper.getById(id);
            //判断是否为起售还是停售
            if (setmeal.getStatus() == StatusConstant.ENABLE){
                //起售中的套餐是不能删除的抛出异常
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });

        //再遍历一次
        ids.forEach(setmealId ->{
            //删除套餐中的数据
            setmealMapper.deleteById(setmealId);

            //删除套餐菜品关系表中的数据
            setmealDishMapper.deleteBySetmealId(setmealId);
        });
    }

    /**
     * 根据id查询套餐和套餐菜品关系
     * @param id
     * @return
     */
    @Override
    public SetmealVO getByIdWithDish(Long id) {
        Setmeal setmeal = setmealMapper.getById(id);
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);

        //创建一个新空对象
        SetmealVO setmealVO = new SetmealVO();
        //将查询到的数据拷贝到新空对象中去
        BeanUtils.copyProperties(setmeal,setmealVO);
        //将之前查到套餐关联的菜品数据设置到VO中,让VO拥有完整的套餐信息与关联菜品的数据
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    /**
     * 修改套餐
     * @param setmealDTO
     */
    @Transactional//保证数据一致
    @Override
    public void update(SetmealDTO setmealDTO) {
        //创建一个新空对象
        Setmeal setmeal = new Setmeal();
        //拷贝
        BeanUtils.copyProperties(setmealDTO,setmeal);

        //1.修改套餐,执行update
        setmealMapper.update(setmeal);

        //查询当前套餐id
//        Long setmealId = setmealDTO.getId();

        //2.删除套餐和菜品关系,操作setmeal_dish表,执行delete(删除)
        setmealDishMapper.deleteBySetmealId(setmealDTO.getId());

        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        //遍历
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealDTO.getId());
        });

        //3.再重新插入套餐和菜品的关联关系,操作setmeal_dish表,执行insert(添加)
        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 套餐起售或者停售
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        //起售套餐是,判断套餐是否有停售菜品,要是有停售菜品就提示"套餐内包含未起售菜品,无法起售"
        if (status == StatusConstant.ENABLE){
            //select a.* from dish a left join setmeal_dish b on a.id = b_dish_id
            //where b.setmeal_id = ?
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            //判断
            if (dishList != null && dishList.size() > 0){
                //遍历
                dishList.forEach(dish -> {
                    //判断要是为停售就抛异常
                    if (dish.getStatus() == StatusConstant.DISABLE){
                        throw new StringIndexOutOfBoundsException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }
        Setmeal setmeal = Setmeal.builder().id(id).status(status).build();
        setmealMapper.update(setmeal);
    }

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     *
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
